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Thursday, January 1, 2026

how to use the id selector in html and css

how to use the id selector in html and css

web designing theory

Syntax of HTML <id> tag


<element id="nuiquename">
.
. content
. 
</element>

  1.  Attribute provide additional information about element 
  2. id attribute unique on entire webpage
  3. id attribute name cannot start with number.
  4. id attribute name cannot space allowed.
  5. id attribute name no allowed space and use - or _ symbols

how to use the id selector in html and css
Example 


<!DOCTYPE html>
<html>
    <head>
        <title> HTML id Attribute </title>
        <style>
            #header{
                 background-color: lightblue;
                 color: black;
                 text-align: center;
                 padding: 20px;
            }
        </style>
    </head>
    <body>
        <h2 id="header"> HTML id Attribute</h2>
        <p> HTML id attribute  use unique name on webpage </p>
       
    </body>
</html>


how to use the id selector in html and css
Explain Program

Step  1] 

<!DOCTYPE html>

  • This declare the document type.
  • browser that the document is written in html

Step 2 ]

<html>.... . </html>

  • html is the root element of the html page.
  •  Every thing inside it is part of the webpage.

Step 3]

<head>
     
  <title> HTML iframe tag </title>
<style>
            #header{
                 background-color: lightblue;
                 color: black;
                 text-align: center;
                 padding: 20px;
            }
        </style>

    </head>

  1.   <head>  section 

  •   head section contains metadata about page. not visible on the page itself.
  •  <title> tag  title section set the title of the page shows the browser tab. 

   2.    CSS Style  

  •  #header  { . . . } 
  •  # symbol represent  selecting id element .
  • #header                    :-   HTML element .
  • background-color    :-   set the background color.
  • color                        :-  set text color.
  • text-align : center    :-   text center element.
  • padding: 20px         :- 20 pixels of space inside element. (top, bottom, right, left)

Step 4]

<body>

  • < body> tag  contains all the content visible to webpage.
  • <body> tag contains  all the visible content of the page.
  • inside <body> show the browser screen.

Step 5]

 
    <body>
<h2 id="header"> HTML id Attribute</h2>
        <p> HTML id attribute  use unique name on webpage </p>
        </body>

       

  •   <h2>                 :-   heading tag .
  • <id="header">   :-   unique identifier name
  • CSS <style>      :-  section style element id.

                header  id attribute appears 

Step 6]

closing the Tag

</body>

 </html>

how to use the id selector in html and css
Output





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